Before I go and build the big lines, I wand to modify these. My goal is to stick a Dayton PT2C-8 in the middle of the curved arrays. This will eliminate the combing. Now I need some sort of crossover. I would like to have a separate high-pass for the tweeter and a low-pass for the line. This would allow me to bi-amp. This will also allow me to match the volume of tweeter to the line. I'd like it to be as steep a slope as possible at 5k. A 4th order crossover satisfies that criteria. I found a calculator online at: